Also, what do you mean by "viable"? Even if an apple is too tart for fresh eating, it will often make a great pie, sauce, or cider apple. The apple varieties w

Also, what do you mean by "viable"? Even if an apple is too tart for fresh eating, it will often make a great pie, sauce, or cider apple. The apple varieties we're all familiar with are selected for transport and keeping. A commercial selection. Not flavour or sugar.